1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_PGTABLE_H
3 #define _ASM_X86_PGTABLE_H
5 #include <linux/mem_encrypt.h>
7 #include <asm/pgtable_types.h>
10 * Macro to mark a page protection value as UC-
12 #define pgprot_noncached(prot) \
13 ((boot_cpu_data.x86 > 3) \
14 ? (__pgprot(pgprot_val(prot) | \
15 cachemode2protval(_PAGE_CACHE_MODE_UC_MINUS))) \
19 #include <linux/spinlock.h>
20 #include <asm/x86_init.h>
22 #include <asm/fpu/api.h>
24 #include <asm-generic/pgtable_uffd.h>
25 #include <linux/page_table_check.h>
27 extern pgd_t early_top_pgt[PTRS_PER_PGD];
28 bool __init __early_make_pgtable(unsigned long address, pmdval_t pmd);
31 void ptdump_walk_pgd_level(struct seq_file *m, struct mm_struct *mm);
32 void ptdump_walk_pgd_level_debugfs(struct seq_file *m, struct mm_struct *mm,
34 void ptdump_walk_pgd_level_checkwx(void);
35 void ptdump_walk_user_pgd_level_checkwx(void);
38 * Macros to add or remove encryption attribute
40 #define pgprot_encrypted(prot) __pgprot(cc_mkenc(pgprot_val(prot)))
41 #define pgprot_decrypted(prot) __pgprot(cc_mkdec(pgprot_val(prot)))
43 #ifdef CONFIG_DEBUG_WX
44 #define debug_checkwx() ptdump_walk_pgd_level_checkwx()
45 #define debug_checkwx_user() ptdump_walk_user_pgd_level_checkwx()
47 #define debug_checkwx() do { } while (0)
48 #define debug_checkwx_user() do { } while (0)
52 * ZERO_PAGE is a global shared page that is always zero: used
53 * for zero-mapped memory areas etc..
55 extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
57 #define ZERO_PAGE(vaddr) ((void)(vaddr),virt_to_page(empty_zero_page))
59 extern spinlock_t pgd_lock;
60 extern struct list_head pgd_list;
62 extern struct mm_struct *pgd_page_get_mm(struct page *page);
64 extern pmdval_t early_pmd_flags;
66 #ifdef CONFIG_PARAVIRT_XXL
67 #include <asm/paravirt.h>
68 #else /* !CONFIG_PARAVIRT_XXL */
69 #define set_pte(ptep, pte) native_set_pte(ptep, pte)
71 #define set_pte_atomic(ptep, pte) \
72 native_set_pte_atomic(ptep, pte)
74 #define set_pmd(pmdp, pmd) native_set_pmd(pmdp, pmd)
76 #ifndef __PAGETABLE_P4D_FOLDED
77 #define set_pgd(pgdp, pgd) native_set_pgd(pgdp, pgd)
78 #define pgd_clear(pgd) (pgtable_l5_enabled() ? native_pgd_clear(pgd) : 0)
82 # define set_p4d(p4dp, p4d) native_set_p4d(p4dp, p4d)
85 #ifndef __PAGETABLE_PUD_FOLDED
86 #define p4d_clear(p4d) native_p4d_clear(p4d)
90 # define set_pud(pudp, pud) native_set_pud(pudp, pud)
93 #ifndef __PAGETABLE_PUD_FOLDED
94 #define pud_clear(pud) native_pud_clear(pud)
97 #define pte_clear(mm, addr, ptep) native_pte_clear(mm, addr, ptep)
98 #define pmd_clear(pmd) native_pmd_clear(pmd)
100 #define pgd_val(x) native_pgd_val(x)
101 #define __pgd(x) native_make_pgd(x)
103 #ifndef __PAGETABLE_P4D_FOLDED
104 #define p4d_val(x) native_p4d_val(x)
105 #define __p4d(x) native_make_p4d(x)
108 #ifndef __PAGETABLE_PUD_FOLDED
109 #define pud_val(x) native_pud_val(x)
110 #define __pud(x) native_make_pud(x)
113 #ifndef __PAGETABLE_PMD_FOLDED
114 #define pmd_val(x) native_pmd_val(x)
115 #define __pmd(x) native_make_pmd(x)
118 #define pte_val(x) native_pte_val(x)
119 #define __pte(x) native_make_pte(x)
121 #define arch_end_context_switch(prev) do {} while(0)
122 #endif /* CONFIG_PARAVIRT_XXL */
125 * The following only work if pte_present() is true.
126 * Undefined behaviour if not..
128 static inline int pte_dirty(pte_t pte)
130 return pte_flags(pte) & _PAGE_DIRTY;
133 static inline int pte_young(pte_t pte)
135 return pte_flags(pte) & _PAGE_ACCESSED;
138 static inline int pmd_dirty(pmd_t pmd)
140 return pmd_flags(pmd) & _PAGE_DIRTY;
143 #define pmd_young pmd_young
144 static inline int pmd_young(pmd_t pmd)
146 return pmd_flags(pmd) & _PAGE_ACCESSED;
149 static inline int pud_dirty(pud_t pud)
151 return pud_flags(pud) & _PAGE_DIRTY;
154 static inline int pud_young(pud_t pud)
156 return pud_flags(pud) & _PAGE_ACCESSED;
159 static inline int pte_write(pte_t pte)
161 return pte_flags(pte) & _PAGE_RW;
164 static inline int pte_huge(pte_t pte)
166 return pte_flags(pte) & _PAGE_PSE;
169 static inline int pte_global(pte_t pte)
171 return pte_flags(pte) & _PAGE_GLOBAL;
174 static inline int pte_exec(pte_t pte)
176 return !(pte_flags(pte) & _PAGE_NX);
179 static inline int pte_special(pte_t pte)
181 return pte_flags(pte) & _PAGE_SPECIAL;
184 /* Entries that were set to PROT_NONE are inverted */
186 static inline u64 protnone_mask(u64 val);
188 static inline unsigned long pte_pfn(pte_t pte)
190 phys_addr_t pfn = pte_val(pte);
191 pfn ^= protnone_mask(pfn);
192 return (pfn & PTE_PFN_MASK) >> PAGE_SHIFT;
195 static inline unsigned long pmd_pfn(pmd_t pmd)
197 phys_addr_t pfn = pmd_val(pmd);
198 pfn ^= protnone_mask(pfn);
199 return (pfn & pmd_pfn_mask(pmd)) >> PAGE_SHIFT;
202 static inline unsigned long pud_pfn(pud_t pud)
204 phys_addr_t pfn = pud_val(pud);
205 pfn ^= protnone_mask(pfn);
206 return (pfn & pud_pfn_mask(pud)) >> PAGE_SHIFT;
209 static inline unsigned long p4d_pfn(p4d_t p4d)
211 return (p4d_val(p4d) & p4d_pfn_mask(p4d)) >> PAGE_SHIFT;
214 static inline unsigned long pgd_pfn(pgd_t pgd)
216 return (pgd_val(pgd) & PTE_PFN_MASK) >> PAGE_SHIFT;
219 #define p4d_leaf p4d_large
220 static inline int p4d_large(p4d_t p4d)
222 /* No 512 GiB pages yet */
226 #define pte_page(pte) pfn_to_page(pte_pfn(pte))
228 #define pmd_leaf pmd_large
229 static inline int pmd_large(pmd_t pte)
231 return pmd_flags(pte) & _PAGE_PSE;
234 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
235 /* NOTE: when predicate huge page, consider also pmd_devmap, or use pmd_large */
236 static inline int pmd_trans_huge(pmd_t pmd)
238 return (pmd_val(pmd) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
241 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
242 static inline int pud_trans_huge(pud_t pud)
244 return (pud_val(pud) & (_PAGE_PSE|_PAGE_DEVMAP)) == _PAGE_PSE;
248 #define has_transparent_hugepage has_transparent_hugepage
249 static inline int has_transparent_hugepage(void)
251 return boot_cpu_has(X86_FEATURE_PSE);
254 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
255 static inline int pmd_devmap(pmd_t pmd)
257 return !!(pmd_val(pmd) & _PAGE_DEVMAP);
260 #ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
261 static inline int pud_devmap(pud_t pud)
263 return !!(pud_val(pud) & _PAGE_DEVMAP);
266 static inline int pud_devmap(pud_t pud)
272 static inline int pgd_devmap(pgd_t pgd)
277 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */
279 static inline pte_t pte_set_flags(pte_t pte, pteval_t set)
281 pteval_t v = native_pte_val(pte);
283 return native_make_pte(v | set);
286 static inline pte_t pte_clear_flags(pte_t pte, pteval_t clear)
288 pteval_t v = native_pte_val(pte);
290 return native_make_pte(v & ~clear);
293 static inline pte_t pte_wrprotect(pte_t pte)
295 return pte_clear_flags(pte, _PAGE_RW);
298 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
299 static inline int pte_uffd_wp(pte_t pte)
301 bool wp = pte_flags(pte) & _PAGE_UFFD_WP;
303 #ifdef CONFIG_DEBUG_VM
305 * Having write bit for wr-protect-marked present ptes is fatal,
306 * because it means the uffd-wp bit will be ignored and write will
309 * Use any chance of pgtable walking to verify this (e.g., when
310 * page swapped out or being migrated for all purposes). It means
311 * something is already wrong. Tell the admin even before the
312 * process crashes. We also nail it with wrong pgtable setup.
314 WARN_ON_ONCE(wp && pte_write(pte));
320 static inline pte_t pte_mkuffd_wp(pte_t pte)
322 return pte_wrprotect(pte_set_flags(pte, _PAGE_UFFD_WP));
325 static inline pte_t pte_clear_uffd_wp(pte_t pte)
327 return pte_clear_flags(pte, _PAGE_UFFD_WP);
329 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
331 static inline pte_t pte_mkclean(pte_t pte)
333 return pte_clear_flags(pte, _PAGE_DIRTY);
336 static inline pte_t pte_mkold(pte_t pte)
338 return pte_clear_flags(pte, _PAGE_ACCESSED);
341 static inline pte_t pte_mkexec(pte_t pte)
343 return pte_clear_flags(pte, _PAGE_NX);
346 static inline pte_t pte_mkdirty(pte_t pte)
348 return pte_set_flags(pte, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
351 static inline pte_t pte_mkyoung(pte_t pte)
353 return pte_set_flags(pte, _PAGE_ACCESSED);
356 static inline pte_t pte_mkwrite(pte_t pte)
358 return pte_set_flags(pte, _PAGE_RW);
361 static inline pte_t pte_mkhuge(pte_t pte)
363 return pte_set_flags(pte, _PAGE_PSE);
366 static inline pte_t pte_clrhuge(pte_t pte)
368 return pte_clear_flags(pte, _PAGE_PSE);
371 static inline pte_t pte_mkglobal(pte_t pte)
373 return pte_set_flags(pte, _PAGE_GLOBAL);
376 static inline pte_t pte_clrglobal(pte_t pte)
378 return pte_clear_flags(pte, _PAGE_GLOBAL);
381 static inline pte_t pte_mkspecial(pte_t pte)
383 return pte_set_flags(pte, _PAGE_SPECIAL);
386 static inline pte_t pte_mkdevmap(pte_t pte)
388 return pte_set_flags(pte, _PAGE_SPECIAL|_PAGE_DEVMAP);
391 static inline pmd_t pmd_set_flags(pmd_t pmd, pmdval_t set)
393 pmdval_t v = native_pmd_val(pmd);
395 return native_make_pmd(v | set);
398 static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear)
400 pmdval_t v = native_pmd_val(pmd);
402 return native_make_pmd(v & ~clear);
405 static inline pmd_t pmd_wrprotect(pmd_t pmd)
407 return pmd_clear_flags(pmd, _PAGE_RW);
410 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
411 static inline int pmd_uffd_wp(pmd_t pmd)
413 return pmd_flags(pmd) & _PAGE_UFFD_WP;
416 static inline pmd_t pmd_mkuffd_wp(pmd_t pmd)
418 return pmd_wrprotect(pmd_set_flags(pmd, _PAGE_UFFD_WP));
421 static inline pmd_t pmd_clear_uffd_wp(pmd_t pmd)
423 return pmd_clear_flags(pmd, _PAGE_UFFD_WP);
425 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
427 static inline pmd_t pmd_mkold(pmd_t pmd)
429 return pmd_clear_flags(pmd, _PAGE_ACCESSED);
432 static inline pmd_t pmd_mkclean(pmd_t pmd)
434 return pmd_clear_flags(pmd, _PAGE_DIRTY);
437 static inline pmd_t pmd_mkdirty(pmd_t pmd)
439 return pmd_set_flags(pmd, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
442 static inline pmd_t pmd_mkdevmap(pmd_t pmd)
444 return pmd_set_flags(pmd, _PAGE_DEVMAP);
447 static inline pmd_t pmd_mkhuge(pmd_t pmd)
449 return pmd_set_flags(pmd, _PAGE_PSE);
452 static inline pmd_t pmd_mkyoung(pmd_t pmd)
454 return pmd_set_flags(pmd, _PAGE_ACCESSED);
457 static inline pmd_t pmd_mkwrite(pmd_t pmd)
459 return pmd_set_flags(pmd, _PAGE_RW);
462 static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
464 pudval_t v = native_pud_val(pud);
466 return native_make_pud(v | set);
469 static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
471 pudval_t v = native_pud_val(pud);
473 return native_make_pud(v & ~clear);
476 static inline pud_t pud_mkold(pud_t pud)
478 return pud_clear_flags(pud, _PAGE_ACCESSED);
481 static inline pud_t pud_mkclean(pud_t pud)
483 return pud_clear_flags(pud, _PAGE_DIRTY);
486 static inline pud_t pud_wrprotect(pud_t pud)
488 return pud_clear_flags(pud, _PAGE_RW);
491 static inline pud_t pud_mkdirty(pud_t pud)
493 return pud_set_flags(pud, _PAGE_DIRTY | _PAGE_SOFT_DIRTY);
496 static inline pud_t pud_mkdevmap(pud_t pud)
498 return pud_set_flags(pud, _PAGE_DEVMAP);
501 static inline pud_t pud_mkhuge(pud_t pud)
503 return pud_set_flags(pud, _PAGE_PSE);
506 static inline pud_t pud_mkyoung(pud_t pud)
508 return pud_set_flags(pud, _PAGE_ACCESSED);
511 static inline pud_t pud_mkwrite(pud_t pud)
513 return pud_set_flags(pud, _PAGE_RW);
516 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
517 static inline int pte_soft_dirty(pte_t pte)
519 return pte_flags(pte) & _PAGE_SOFT_DIRTY;
522 static inline int pmd_soft_dirty(pmd_t pmd)
524 return pmd_flags(pmd) & _PAGE_SOFT_DIRTY;
527 static inline int pud_soft_dirty(pud_t pud)
529 return pud_flags(pud) & _PAGE_SOFT_DIRTY;
532 static inline pte_t pte_mksoft_dirty(pte_t pte)
534 return pte_set_flags(pte, _PAGE_SOFT_DIRTY);
537 static inline pmd_t pmd_mksoft_dirty(pmd_t pmd)
539 return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
542 static inline pud_t pud_mksoft_dirty(pud_t pud)
544 return pud_set_flags(pud, _PAGE_SOFT_DIRTY);
547 static inline pte_t pte_clear_soft_dirty(pte_t pte)
549 return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
552 static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
554 return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
557 static inline pud_t pud_clear_soft_dirty(pud_t pud)
559 return pud_clear_flags(pud, _PAGE_SOFT_DIRTY);
562 #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
565 * Mask out unsupported bits in a present pgprot. Non-present pgprots
566 * can use those bits for other purposes, so leave them be.
568 static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
570 pgprotval_t protval = pgprot_val(pgprot);
572 if (protval & _PAGE_PRESENT)
573 protval &= __supported_pte_mask;
578 static inline pgprotval_t check_pgprot(pgprot_t pgprot)
580 pgprotval_t massaged_val = massage_pgprot(pgprot);
582 /* mmdebug.h can not be included here because of dependencies */
583 #ifdef CONFIG_DEBUG_VM
584 WARN_ONCE(pgprot_val(pgprot) != massaged_val,
585 "attempted to set unsupported pgprot: %016llx "
586 "bits: %016llx supported: %016llx\n",
587 (u64)pgprot_val(pgprot),
588 (u64)pgprot_val(pgprot) ^ massaged_val,
589 (u64)__supported_pte_mask);
595 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
597 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
598 pfn ^= protnone_mask(pgprot_val(pgprot));
600 return __pte(pfn | check_pgprot(pgprot));
603 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
605 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
606 pfn ^= protnone_mask(pgprot_val(pgprot));
607 pfn &= PHYSICAL_PMD_PAGE_MASK;
608 return __pmd(pfn | check_pgprot(pgprot));
611 static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
613 phys_addr_t pfn = (phys_addr_t)page_nr << PAGE_SHIFT;
614 pfn ^= protnone_mask(pgprot_val(pgprot));
615 pfn &= PHYSICAL_PUD_PAGE_MASK;
616 return __pud(pfn | check_pgprot(pgprot));
619 static inline pmd_t pmd_mkinvalid(pmd_t pmd)
621 return pfn_pmd(pmd_pfn(pmd),
622 __pgprot(pmd_flags(pmd) & ~(_PAGE_PRESENT|_PAGE_PROTNONE)));
625 static inline u64 flip_protnone_guard(u64 oldval, u64 val, u64 mask);
627 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
629 pteval_t val = pte_val(pte), oldval = val;
632 * Chop off the NX bit (if present), and add the NX portion of
633 * the newprot (if present):
635 val &= _PAGE_CHG_MASK;
636 val |= check_pgprot(newprot) & ~_PAGE_CHG_MASK;
637 val = flip_protnone_guard(oldval, val, PTE_PFN_MASK);
641 static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
643 pmdval_t val = pmd_val(pmd), oldval = val;
645 val &= _HPAGE_CHG_MASK;
646 val |= check_pgprot(newprot) & ~_HPAGE_CHG_MASK;
647 val = flip_protnone_guard(oldval, val, PHYSICAL_PMD_PAGE_MASK);
652 * mprotect needs to preserve PAT and encryption bits when updating
655 #define pgprot_modify pgprot_modify
656 static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
658 pgprotval_t preservebits = pgprot_val(oldprot) & _PAGE_CHG_MASK;
659 pgprotval_t addbits = pgprot_val(newprot) & ~_PAGE_CHG_MASK;
660 return __pgprot(preservebits | addbits);
663 #define pte_pgprot(x) __pgprot(pte_flags(x))
664 #define pmd_pgprot(x) __pgprot(pmd_flags(x))
665 #define pud_pgprot(x) __pgprot(pud_flags(x))
666 #define p4d_pgprot(x) __pgprot(p4d_flags(x))
668 #define canon_pgprot(p) __pgprot(massage_pgprot(p))
670 static inline int is_new_memtype_allowed(u64 paddr, unsigned long size,
671 enum page_cache_mode pcm,
672 enum page_cache_mode new_pcm)
675 * PAT type is always WB for untracked ranges, so no need to check.
677 if (x86_platform.is_untracked_pat_range(paddr, paddr + size))
681 * Certain new memtypes are not allowed with certain
683 * - request is uncached, return cannot be write-back
684 * - request is write-combine, return cannot be write-back
685 * - request is write-through, return cannot be write-back
686 * - request is write-through, return cannot be write-combine
688 if ((pcm == _PAGE_CACHE_MODE_UC_MINUS &&
689 new_pcm == _PAGE_CACHE_MODE_WB) ||
690 (pcm == _PAGE_CACHE_MODE_WC &&
691 new_pcm == _PAGE_CACHE_MODE_WB) ||
692 (pcm == _PAGE_CACHE_MODE_WT &&
693 new_pcm == _PAGE_CACHE_MODE_WB) ||
694 (pcm == _PAGE_CACHE_MODE_WT &&
695 new_pcm == _PAGE_CACHE_MODE_WC)) {
702 pmd_t *populate_extra_pmd(unsigned long vaddr);
703 pte_t *populate_extra_pte(unsigned long vaddr);
705 #ifdef CONFIG_PAGE_TABLE_ISOLATION
706 pgd_t __pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd);
709 * Take a PGD location (pgdp) and a pgd value that needs to be set there.
710 * Populates the user and returns the resulting PGD that must be set in
711 * the kernel copy of the page tables.
713 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
715 if (!static_cpu_has(X86_FEATURE_PTI))
717 return __pti_set_user_pgtbl(pgdp, pgd);
719 #else /* CONFIG_PAGE_TABLE_ISOLATION */
720 static inline pgd_t pti_set_user_pgtbl(pgd_t *pgdp, pgd_t pgd)
724 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
726 #endif /* __ASSEMBLY__ */
730 # include <asm/pgtable_32.h>
732 # include <asm/pgtable_64.h>
736 #include <linux/mm_types.h>
737 #include <linux/mmdebug.h>
738 #include <linux/log2.h>
739 #include <asm/fixmap.h>
741 static inline int pte_none(pte_t pte)
743 return !(pte.pte & ~(_PAGE_KNL_ERRATUM_MASK));
746 #define __HAVE_ARCH_PTE_SAME
747 static inline int pte_same(pte_t a, pte_t b)
749 return a.pte == b.pte;
752 static inline int pte_present(pte_t a)
754 return pte_flags(a) & (_PAGE_PRESENT | _PAGE_PROTNONE);
757 #ifdef CONFIG_ARCH_HAS_PTE_DEVMAP
758 static inline int pte_devmap(pte_t a)
760 return (pte_flags(a) & _PAGE_DEVMAP) == _PAGE_DEVMAP;
764 #define pte_accessible pte_accessible
765 static inline bool pte_accessible(struct mm_struct *mm, pte_t a)
767 if (pte_flags(a) & _PAGE_PRESENT)
770 if ((pte_flags(a) & _PAGE_PROTNONE) &&
771 atomic_read(&mm->tlb_flush_pending))
777 static inline int pmd_present(pmd_t pmd)
780 * Checking for _PAGE_PSE is needed too because
781 * split_huge_page will temporarily clear the present bit (but
782 * the _PAGE_PSE flag will remain set at all times while the
783 * _PAGE_PRESENT bit is clear).
785 return pmd_flags(pmd) & (_PAGE_PRESENT | _PAGE_PROTNONE | _PAGE_PSE);
788 #ifdef CONFIG_NUMA_BALANCING
790 * These work without NUMA balancing but the kernel does not care. See the
791 * comment in include/linux/pgtable.h
793 static inline int pte_protnone(pte_t pte)
795 return (pte_flags(pte) & (_PAGE_PROTNONE | _PAGE_PRESENT))
799 static inline int pmd_protnone(pmd_t pmd)
801 return (pmd_flags(pmd) & (_PAGE_PROTNONE | _PAGE_PRESENT))
804 #endif /* CONFIG_NUMA_BALANCING */
806 static inline int pmd_none(pmd_t pmd)
808 /* Only check low word on 32-bit platforms, since it might be
809 out of sync with upper half. */
810 unsigned long val = native_pmd_val(pmd);
811 return (val & ~_PAGE_KNL_ERRATUM_MASK) == 0;
814 static inline unsigned long pmd_page_vaddr(pmd_t pmd)
816 return (unsigned long)__va(pmd_val(pmd) & pmd_pfn_mask(pmd));
820 * Currently stuck as a macro due to indirect forward reference to
821 * linux/mmzone.h's __section_mem_map_addr() definition:
823 #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd))
826 * Conversion functions: convert a page and protection to a page entry,
827 * and a page entry and page directory to the page they refer to.
829 * (Currently stuck as a macro because of indirect forward reference
830 * to linux/mm.h:page_to_nid())
832 #define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
834 static inline int pmd_bad(pmd_t pmd)
836 return (pmd_flags(pmd) & ~(_PAGE_USER | _PAGE_ACCESSED)) !=
837 (_KERNPG_TABLE & ~_PAGE_ACCESSED);
840 static inline unsigned long pages_to_mb(unsigned long npg)
842 return npg >> (20 - PAGE_SHIFT);
845 #if CONFIG_PGTABLE_LEVELS > 2
846 static inline int pud_none(pud_t pud)
848 return (native_pud_val(pud) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
851 static inline int pud_present(pud_t pud)
853 return pud_flags(pud) & _PAGE_PRESENT;
856 static inline pmd_t *pud_pgtable(pud_t pud)
858 return (pmd_t *)__va(pud_val(pud) & pud_pfn_mask(pud));
862 * Currently stuck as a macro due to indirect forward reference to
863 * linux/mmzone.h's __section_mem_map_addr() definition:
865 #define pud_page(pud) pfn_to_page(pud_pfn(pud))
867 #define pud_leaf pud_large
868 static inline int pud_large(pud_t pud)
870 return (pud_val(pud) & (_PAGE_PSE | _PAGE_PRESENT)) ==
871 (_PAGE_PSE | _PAGE_PRESENT);
874 static inline int pud_bad(pud_t pud)
876 return (pud_flags(pud) & ~(_KERNPG_TABLE | _PAGE_USER)) != 0;
879 #define pud_leaf pud_large
880 static inline int pud_large(pud_t pud)
884 #endif /* CONFIG_PGTABLE_LEVELS > 2 */
886 #if CONFIG_PGTABLE_LEVELS > 3
887 static inline int p4d_none(p4d_t p4d)
889 return (native_p4d_val(p4d) & ~(_PAGE_KNL_ERRATUM_MASK)) == 0;
892 static inline int p4d_present(p4d_t p4d)
894 return p4d_flags(p4d) & _PAGE_PRESENT;
897 static inline pud_t *p4d_pgtable(p4d_t p4d)
899 return (pud_t *)__va(p4d_val(p4d) & p4d_pfn_mask(p4d));
903 * Currently stuck as a macro due to indirect forward reference to
904 * linux/mmzone.h's __section_mem_map_addr() definition:
906 #define p4d_page(p4d) pfn_to_page(p4d_pfn(p4d))
908 static inline int p4d_bad(p4d_t p4d)
910 unsigned long ignore_flags = _KERNPG_TABLE | _PAGE_USER;
912 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
913 ignore_flags |= _PAGE_NX;
915 return (p4d_flags(p4d) & ~ignore_flags) != 0;
917 #endif /* CONFIG_PGTABLE_LEVELS > 3 */
919 static inline unsigned long p4d_index(unsigned long address)
921 return (address >> P4D_SHIFT) & (PTRS_PER_P4D - 1);
924 #if CONFIG_PGTABLE_LEVELS > 4
925 static inline int pgd_present(pgd_t pgd)
927 if (!pgtable_l5_enabled())
929 return pgd_flags(pgd) & _PAGE_PRESENT;
932 static inline unsigned long pgd_page_vaddr(pgd_t pgd)
934 return (unsigned long)__va((unsigned long)pgd_val(pgd) & PTE_PFN_MASK);
938 * Currently stuck as a macro due to indirect forward reference to
939 * linux/mmzone.h's __section_mem_map_addr() definition:
941 #define pgd_page(pgd) pfn_to_page(pgd_pfn(pgd))
943 /* to find an entry in a page-table-directory. */
944 static inline p4d_t *p4d_offset(pgd_t *pgd, unsigned long address)
946 if (!pgtable_l5_enabled())
948 return (p4d_t *)pgd_page_vaddr(*pgd) + p4d_index(address);
951 static inline int pgd_bad(pgd_t pgd)
953 unsigned long ignore_flags = _PAGE_USER;
955 if (!pgtable_l5_enabled())
958 if (IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION))
959 ignore_flags |= _PAGE_NX;
961 return (pgd_flags(pgd) & ~ignore_flags) != _KERNPG_TABLE;
964 static inline int pgd_none(pgd_t pgd)
966 if (!pgtable_l5_enabled())
969 * There is no need to do a workaround for the KNL stray
970 * A/D bit erratum here. PGDs only point to page tables
971 * except on 32-bit non-PAE which is not supported on
974 return !native_pgd_val(pgd);
976 #endif /* CONFIG_PGTABLE_LEVELS > 4 */
978 #endif /* __ASSEMBLY__ */
980 #define KERNEL_PGD_BOUNDARY pgd_index(PAGE_OFFSET)
981 #define KERNEL_PGD_PTRS (PTRS_PER_PGD - KERNEL_PGD_BOUNDARY)
985 extern int direct_gbpages;
986 void init_mem_mapping(void);
987 void early_alloc_pgt_buf(void);
988 extern void memblock_find_dma_reserve(void);
989 void __init poking_init(void);
990 unsigned long init_memory_mapping(unsigned long start,
991 unsigned long end, pgprot_t prot);
994 extern pgd_t trampoline_pgd_entry;
997 /* local pte updates need not use xchg for locking */
998 static inline pte_t native_local_ptep_get_and_clear(pte_t *ptep)
1002 /* Pure native function needs no input for mm, addr */
1003 native_pte_clear(NULL, 0, ptep);
1007 static inline pmd_t native_local_pmdp_get_and_clear(pmd_t *pmdp)
1011 native_pmd_clear(pmdp);
1015 static inline pud_t native_local_pudp_get_and_clear(pud_t *pudp)
1019 native_pud_clear(pudp);
1023 static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
1024 pte_t *ptep, pte_t pte)
1026 page_table_check_pte_set(mm, ptep, pte);
1030 static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
1031 pmd_t *pmdp, pmd_t pmd)
1033 page_table_check_pmd_set(mm, pmdp, pmd);
1037 static inline void set_pud_at(struct mm_struct *mm, unsigned long addr,
1038 pud_t *pudp, pud_t pud)
1040 page_table_check_pud_set(mm, addr, pudp, pud);
1041 native_set_pud(pudp, pud);
1045 * We only update the dirty/accessed state if we set
1046 * the dirty bit by hand in the kernel, since the hardware
1047 * will do the accessed bit for us, and we don't want to
1048 * race with other CPU's that might be updating the dirty
1049 * bit at the same time.
1051 struct vm_area_struct;
1053 #define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
1054 extern int ptep_set_access_flags(struct vm_area_struct *vma,
1055 unsigned long address, pte_t *ptep,
1056 pte_t entry, int dirty);
1058 #define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
1059 extern int ptep_test_and_clear_young(struct vm_area_struct *vma,
1060 unsigned long addr, pte_t *ptep);
1062 #define __HAVE_ARCH_PTEP_CLEAR_YOUNG_FLUSH
1063 extern int ptep_clear_flush_young(struct vm_area_struct *vma,
1064 unsigned long address, pte_t *ptep);
1066 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR
1067 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
1070 pte_t pte = native_ptep_get_and_clear(ptep);
1071 page_table_check_pte_clear(mm, pte);
1075 #define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1076 static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
1077 unsigned long addr, pte_t *ptep,
1083 * Full address destruction in progress; paravirt does not
1084 * care about updates and native needs no locking
1086 pte = native_local_ptep_get_and_clear(ptep);
1087 page_table_check_pte_clear(mm, pte);
1089 pte = ptep_get_and_clear(mm, addr, ptep);
1094 #define __HAVE_ARCH_PTEP_SET_WRPROTECT
1095 static inline void ptep_set_wrprotect(struct mm_struct *mm,
1096 unsigned long addr, pte_t *ptep)
1098 clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
1101 #define flush_tlb_fix_spurious_fault(vma, address, ptep) do { } while (0)
1103 #define mk_pmd(page, pgprot) pfn_pmd(page_to_pfn(page), (pgprot))
1105 #define __HAVE_ARCH_PMDP_SET_ACCESS_FLAGS
1106 extern int pmdp_set_access_flags(struct vm_area_struct *vma,
1107 unsigned long address, pmd_t *pmdp,
1108 pmd_t entry, int dirty);
1109 extern int pudp_set_access_flags(struct vm_area_struct *vma,
1110 unsigned long address, pud_t *pudp,
1111 pud_t entry, int dirty);
1113 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
1114 extern int pmdp_test_and_clear_young(struct vm_area_struct *vma,
1115 unsigned long addr, pmd_t *pmdp);
1116 extern int pudp_test_and_clear_young(struct vm_area_struct *vma,
1117 unsigned long addr, pud_t *pudp);
1119 #define __HAVE_ARCH_PMDP_CLEAR_YOUNG_FLUSH
1120 extern int pmdp_clear_flush_young(struct vm_area_struct *vma,
1121 unsigned long address, pmd_t *pmdp);
1124 #define pmd_write pmd_write
1125 static inline int pmd_write(pmd_t pmd)
1127 return pmd_flags(pmd) & _PAGE_RW;
1130 #define __HAVE_ARCH_PMDP_HUGE_GET_AND_CLEAR
1131 static inline pmd_t pmdp_huge_get_and_clear(struct mm_struct *mm, unsigned long addr,
1134 pmd_t pmd = native_pmdp_get_and_clear(pmdp);
1136 page_table_check_pmd_clear(mm, pmd);
1141 #define __HAVE_ARCH_PUDP_HUGE_GET_AND_CLEAR
1142 static inline pud_t pudp_huge_get_and_clear(struct mm_struct *mm,
1143 unsigned long addr, pud_t *pudp)
1145 pud_t pud = native_pudp_get_and_clear(pudp);
1147 page_table_check_pud_clear(mm, pud);
1152 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
1153 static inline void pmdp_set_wrprotect(struct mm_struct *mm,
1154 unsigned long addr, pmd_t *pmdp)
1156 clear_bit(_PAGE_BIT_RW, (unsigned long *)pmdp);
1159 #define pud_write pud_write
1160 static inline int pud_write(pud_t pud)
1162 return pud_flags(pud) & _PAGE_RW;
1165 #ifndef pmdp_establish
1166 #define pmdp_establish pmdp_establish
1167 static inline pmd_t pmdp_establish(struct vm_area_struct *vma,
1168 unsigned long address, pmd_t *pmdp, pmd_t pmd)
1170 page_table_check_pmd_set(vma->vm_mm, pmdp, pmd);
1171 if (IS_ENABLED(CONFIG_SMP)) {
1172 return xchg(pmdp, pmd);
1175 WRITE_ONCE(*pmdp, pmd);
1181 #define __HAVE_ARCH_PMDP_INVALIDATE_AD
1182 extern pmd_t pmdp_invalidate_ad(struct vm_area_struct *vma,
1183 unsigned long address, pmd_t *pmdp);
1186 * Page table pages are page-aligned. The lower half of the top
1187 * level is used for userspace and the top half for the kernel.
1189 * Returns true for parts of the PGD that map userspace and
1190 * false for the parts that map the kernel.
1192 static inline bool pgdp_maps_userspace(void *__ptr)
1194 unsigned long ptr = (unsigned long)__ptr;
1196 return (((ptr & ~PAGE_MASK) / sizeof(pgd_t)) < PGD_KERNEL_START);
1199 #define pgd_leaf pgd_large
1200 static inline int pgd_large(pgd_t pgd) { return 0; }
1202 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1204 * All top-level PAGE_TABLE_ISOLATION page tables are order-1 pages
1205 * (8k-aligned and 8k in size). The kernel one is at the beginning 4k and
1206 * the user one is in the last 4k. To switch between them, you
1207 * just need to flip the 12th bit in their addresses.
1209 #define PTI_PGTABLE_SWITCH_BIT PAGE_SHIFT
1212 * This generates better code than the inline assembly in
1215 static inline void *ptr_set_bit(void *ptr, int bit)
1217 unsigned long __ptr = (unsigned long)ptr;
1220 return (void *)__ptr;
1222 static inline void *ptr_clear_bit(void *ptr, int bit)
1224 unsigned long __ptr = (unsigned long)ptr;
1227 return (void *)__ptr;
1230 static inline pgd_t *kernel_to_user_pgdp(pgd_t *pgdp)
1232 return ptr_set_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1235 static inline pgd_t *user_to_kernel_pgdp(pgd_t *pgdp)
1237 return ptr_clear_bit(pgdp, PTI_PGTABLE_SWITCH_BIT);
1240 static inline p4d_t *kernel_to_user_p4dp(p4d_t *p4dp)
1242 return ptr_set_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1245 static inline p4d_t *user_to_kernel_p4dp(p4d_t *p4dp)
1247 return ptr_clear_bit(p4dp, PTI_PGTABLE_SWITCH_BIT);
1249 #endif /* CONFIG_PAGE_TABLE_ISOLATION */
1252 * clone_pgd_range(pgd_t *dst, pgd_t *src, int count);
1254 * dst - pointer to pgd range anywhere on a pgd page
1256 * count - the number of pgds to copy.
1258 * dst and src can be on the same page, but the range must not overlap,
1259 * and must not cross a page boundary.
1261 static inline void clone_pgd_range(pgd_t *dst, pgd_t *src, int count)
1263 memcpy(dst, src, count * sizeof(pgd_t));
1264 #ifdef CONFIG_PAGE_TABLE_ISOLATION
1265 if (!static_cpu_has(X86_FEATURE_PTI))
1267 /* Clone the user space pgd as well */
1268 memcpy(kernel_to_user_pgdp(dst), kernel_to_user_pgdp(src),
1269 count * sizeof(pgd_t));
1273 #define PTE_SHIFT ilog2(PTRS_PER_PTE)
1274 static inline int page_level_shift(enum pg_level level)
1276 return (PAGE_SHIFT - PTE_SHIFT) + level * PTE_SHIFT;
1278 static inline unsigned long page_level_size(enum pg_level level)
1280 return 1UL << page_level_shift(level);
1282 static inline unsigned long page_level_mask(enum pg_level level)
1284 return ~(page_level_size(level) - 1);
1288 * The x86 doesn't have any external MMU info: the kernel page
1289 * tables contain all the necessary information.
1291 static inline void update_mmu_cache(struct vm_area_struct *vma,
1292 unsigned long addr, pte_t *ptep)
1295 static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
1296 unsigned long addr, pmd_t *pmd)
1299 static inline void update_mmu_cache_pud(struct vm_area_struct *vma,
1300 unsigned long addr, pud_t *pud)
1303 static inline pte_t pte_swp_mkexclusive(pte_t pte)
1305 return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE);
1308 static inline int pte_swp_exclusive(pte_t pte)
1310 return pte_flags(pte) & _PAGE_SWP_EXCLUSIVE;
1313 static inline pte_t pte_swp_clear_exclusive(pte_t pte)
1315 return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE);
1318 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
1319 static inline pte_t pte_swp_mksoft_dirty(pte_t pte)
1321 return pte_set_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1324 static inline int pte_swp_soft_dirty(pte_t pte)
1326 return pte_flags(pte) & _PAGE_SWP_SOFT_DIRTY;
1329 static inline pte_t pte_swp_clear_soft_dirty(pte_t pte)
1331 return pte_clear_flags(pte, _PAGE_SWP_SOFT_DIRTY);
1334 #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION
1335 static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd)
1337 return pmd_set_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1340 static inline int pmd_swp_soft_dirty(pmd_t pmd)
1342 return pmd_flags(pmd) & _PAGE_SWP_SOFT_DIRTY;
1345 static inline pmd_t pmd_swp_clear_soft_dirty(pmd_t pmd)
1347 return pmd_clear_flags(pmd, _PAGE_SWP_SOFT_DIRTY);
1352 #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP
1353 static inline pte_t pte_swp_mkuffd_wp(pte_t pte)
1355 return pte_set_flags(pte, _PAGE_SWP_UFFD_WP);
1358 static inline int pte_swp_uffd_wp(pte_t pte)
1360 return pte_flags(pte) & _PAGE_SWP_UFFD_WP;
1363 static inline pte_t pte_swp_clear_uffd_wp(pte_t pte)
1365 return pte_clear_flags(pte, _PAGE_SWP_UFFD_WP);
1368 static inline pmd_t pmd_swp_mkuffd_wp(pmd_t pmd)
1370 return pmd_set_flags(pmd, _PAGE_SWP_UFFD_WP);
1373 static inline int pmd_swp_uffd_wp(pmd_t pmd)
1375 return pmd_flags(pmd) & _PAGE_SWP_UFFD_WP;
1378 static inline pmd_t pmd_swp_clear_uffd_wp(pmd_t pmd)
1380 return pmd_clear_flags(pmd, _PAGE_SWP_UFFD_WP);
1382 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_WP */
1384 static inline u16 pte_flags_pkey(unsigned long pte_flags)
1386 #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
1387 /* ifdef to avoid doing 59-bit shift on 32-bit values */
1388 return (pte_flags & _PAGE_PKEY_MASK) >> _PAGE_BIT_PKEY_BIT0;
1394 static inline bool __pkru_allows_pkey(u16 pkey, bool write)
1396 u32 pkru = read_pkru();
1398 if (!__pkru_allows_read(pkru, pkey))
1400 if (write && !__pkru_allows_write(pkru, pkey))
1407 * 'pteval' can come from a PTE, PMD or PUD. We only check
1408 * _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
1409 * same value on all 3 types.
1411 static inline bool __pte_access_permitted(unsigned long pteval, bool write)
1413 unsigned long need_pte_bits = _PAGE_PRESENT|_PAGE_USER;
1416 need_pte_bits |= _PAGE_RW;
1418 if ((pteval & need_pte_bits) != need_pte_bits)
1421 return __pkru_allows_pkey(pte_flags_pkey(pteval), write);
1424 #define pte_access_permitted pte_access_permitted
1425 static inline bool pte_access_permitted(pte_t pte, bool write)
1427 return __pte_access_permitted(pte_val(pte), write);
1430 #define pmd_access_permitted pmd_access_permitted
1431 static inline bool pmd_access_permitted(pmd_t pmd, bool write)
1433 return __pte_access_permitted(pmd_val(pmd), write);
1436 #define pud_access_permitted pud_access_permitted
1437 static inline bool pud_access_permitted(pud_t pud, bool write)
1439 return __pte_access_permitted(pud_val(pud), write);
1442 #define __HAVE_ARCH_PFN_MODIFY_ALLOWED 1
1443 extern bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot);
1445 static inline bool arch_has_pfn_modify_check(void)
1447 return boot_cpu_has_bug(X86_BUG_L1TF);
1450 #define arch_has_hw_pte_young arch_has_hw_pte_young
1451 static inline bool arch_has_hw_pte_young(void)
1456 #ifdef CONFIG_XEN_PV
1457 #define arch_has_hw_nonleaf_pmd_young arch_has_hw_nonleaf_pmd_young
1458 static inline bool arch_has_hw_nonleaf_pmd_young(void)
1460 return !cpu_feature_enabled(X86_FEATURE_XENPV);
1464 #ifdef CONFIG_PAGE_TABLE_CHECK
1465 static inline bool pte_user_accessible_page(pte_t pte)
1467 return (pte_val(pte) & _PAGE_PRESENT) && (pte_val(pte) & _PAGE_USER);
1470 static inline bool pmd_user_accessible_page(pmd_t pmd)
1472 return pmd_leaf(pmd) && (pmd_val(pmd) & _PAGE_PRESENT) && (pmd_val(pmd) & _PAGE_USER);
1475 static inline bool pud_user_accessible_page(pud_t pud)
1477 return pud_leaf(pud) && (pud_val(pud) & _PAGE_PRESENT) && (pud_val(pud) & _PAGE_USER);
1481 #endif /* __ASSEMBLY__ */
1483 #endif /* _ASM_X86_PGTABLE_H */